Question
Evaluate $999^3$ using suitable identity.
✓
Answer
We have, $(999)^3=(1000-1)^3$
$=(1000)^3-(1)^3-3(1000)(1)(1000-1)$
$=1000000000-1-2997000$
$=997002999$
$=(1000)^3-(1)^3-3(1000)(1)(1000-1)$
$=1000000000-1-2997000$
$=997002999$
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